The first step to doing anything with Blankstorm is to get a clone of the game locally.
Download and install Git from https://git-scm.com/downloads.
You should enable the "Git GUI here" and "Git Bash here" options if you are using Windows 10 as that will make step 2 easier. You must include support for Git LFS.
Find a folder where you would like to put your local clone, then open Git Bash (either using "Git Bash here" or using Windows terminal) from the right-click or context menu.